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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

期刊文章

Inactivation of pectinesterase in orange and grapefruit juices by high pressure  [1998]

Goodner, J.K. (University of Florida, Lake Alfred, FL.); Braddock, R.J.; Parish, M.E.;

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The enzyme pectinesterase (PE) reduces the quality of citrus juices. Current inactivation of the enzyme is accomplished by heat, resulting in a loss of fresh fruit flavor in the juice. We explored the use of pressurized treatments of orange and grapefruit juices to bypass the use of extreme heat during processing. PE inactivation using isostatic high pressure in the range of 500-900 MPa was accomplished in orange and grapefruit juices. The higher pressures (600 MPa) caused instantaneous inactivation of the heat labile form of the enzyme but did not inactivate the heat stable form of PE. Treatment times caused significantly different (alpha = 0.05) total PE activity losses in orange but not in grapefruit juices, and PE inactivation at different pressures was significantly different in both juices. Heat labile grapefruit PE was also more sensitive than orange to pressure. D(p) values for orange PE inactivation at 500 and 600 MPa were 83.3 and 2.4 min, respectively; while the z(p) value between 500 and 600 MPa was 65 MPa. Orange juice pressurized at 700 MPa for 1 min had no cloud loss for 50 days
来自期刊
Journal of agricultural and food chemistry (USA)
ISSN : 0021-8561

书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
1999
卷:
46
期:
5
起始页:
1997
结束页:
2000
所有题名:
"Inactivation of pectinesterase in orange and grapefruit juices by high pressure"@eng
其它:
"references"
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
1999
卷:
46
期:
5
起始页:
1997
结束页:
2000
所有题名:
"Inactivation of pectinesterase in orange and grapefruit juices by high pressure"@eng
其它:
"references"